Sleep mask



FIG. 1 is a perspective view of the sleep mask.

FIG. 2 is a top view of the sleep mask as shown FIG. 1.

FIG. 3 is a bottom view thereof.

FIG. 4 is a left side view of FIG. 1.

FIG. 5 is a right side view of FIG. 1.

FIG. 6 is a rear view of FIG. 1; and,

FIG. 7 is a front view thereof. 

CLAIM The ornamental design for a sleep mask, as shown and described. 